EE WAS CUTTING DEBRIS OFF HDPE PIPE END WITH A POCKET KNIFE. THE KNIFE SLIPPED OFF THE MATERIAL AND STRUCK HIS R THUMB. HE RECEIVED APPROX. 1"" U SHAPED LACERATION ON PAD OF R THUMB. SEEN AND D R'S OFFICE AND GIVEN 5 STITCHES AND TETNUS SHOOT RETURN TO WORK BUT KEEP WOUND DRY.